243
(MT11 - Gb2006)
1+1
I
NTERCOM
*
4+1 V
IDEOINTERCOM
INSTALLATION INSTRUCTIONS
- The cable runs of intercom and video intercom installations must be kept separate
from the mains or any other electrical installation as required by the International
Safety Standards and the entire installation must be realized in compliance with the
safety rules in force in any specific Country.
- It is necessary to provide a disconnecting and safety switch before the power supply.
Use a single general switch in case of several power supplies (also in multiple entrance).
- Before connecting the power supply make sure that its rating data corresponds to this
of the mains.
- For electromagnetic reasons, all service modules must be installed near their power
supply.
Wires
1) For the correct operation of the intercom and videointercom system you must choose
the correct type of cable.
2) Wires must be dimensioned according to the distance of the different devices and their
current consumption.
3) Do not connect wires in parallel to reach the required cross-section (for example multi-
pair telephone cables). Only use a single wire with suitable cross-section. When using
multi-core cables you must select them with low parasite parameters (low capacitance
per meter, low inductance over Ohm).
4) If the installation includes additional power supplies you must place them near the
device to be powered.
Background noise
To avoid possible background noise over the speech line, it is advisable:
5) not to lay intercom or telephone cables in the same runaway as the wires used to power
alternate current loads;
6) to avoid using the same multi-core cable to transmit audio signals and alternate current
power supplies (lamps, amplified external door stations, electrical door locks). Always
use separate wires for alternate current power supplies;
7) for name-plate lamps, to use an additional 12Vac transformer (PRS210 type) with
suitable power (consumption is 75mA for each lamp) with 2 power supply wires
separate from audio wires;
8) in case of long distances between the external door station and the last intercom, to
place the power supply near by the external door station.
VIDEO SIGNAL DISTRIBUTION WITH
TWISTED PAIR
If the distance between the camera and the last video
intercom in the system is lower than 200 m, the con-
nection can be made with 2x0.35mm² wires (Ø=0,6mm;
AWG22) instead of the coaxial cable. For distances
from 100m to 200m a twisted pair must be used.
For the connection of the video signal you can choose
from:
- connection with junction box
- serial connection (input and output)
- connection with floor distributors
CONNECTION WITH JUNCTION BOX
All wires are distributed in the floor junction box.
Due to the signal loss introduced by each connection,
the maximum number of video intercoms that can be
connected in serial mode is 20. Two 75
Ω
resistances
must be inserted between X and F and between Y and
F in the last video intercom. The maximum distance
between the video intercoms and the connector block
is 2.5 metres.
X
X
Y
Y
SERIAL CONNECTION
Connections are made on the video intercom brack-
ets, and not in the junction box. Due to the signal loss
introduced by each connection, the maximum number
of video intercoms that can be connected in serial
mode is 20. Two 75
Ω
resistances must be inserted
between X and F and between Y and F in the last video
intercom.
X
Y
H
F
X
Y
H
F
PT5111
KM8111
X
Y
H
F
X
Y
H
F
PT5111
KM8111
WIRE CROSS SECTION
m.
50
100
200
mm²
S
0.5
0.75
1
mm
Ø
0.8
1
1.2
Article terminals
Distance
mm²
S
0.75
1
2
mm
Ø
1
1.2
1.4
1 . 3 (intercom)
10 . 4 . 1 . C- (videointercom)
F . H . A . S.
(wires in bold face type)
AWG
20
18
16
AWG
18
16
14
feet
165
330
660
